Question-126572

Question Number 126572 by sdfg last updated on 22/Dec/20

Answered by liberty last updated on 22/Dec/20

∣ \vec{a} + \vec{b} ∣^{2} = ∣ \vec{a} ∣^{2} + ∣ \vec{b} ∣^{2} + 2 ∣ \vec{a} ∣∣ \vec{b} ∣ \cos α

50 = 25 + 25 + 2 (5) (5) \cos α

\cos α = 0 \to α = \frac{π}{2}

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